File:Travertine dripstone (Skyline Caverns, Front Royal, Virginia, USA) 1.jpg

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English: Travertine dripstone in a cave in Virginia, USA.

"Cave formations" in caves are technically called speleothem. Most speleothem is composed of travertine, a crystalline-textured chemical sedimentary rock composed of calcite (CaCO3). Travertine forms in most caves and at some springs by precipitation of crystals from water. Travertine speleothem occurs in a wide variety of forms. The most common variety of travertine speleothem is dripstone, which forms by the action of dripping water. Downward-tapering dripstone structures attached to cave ceilings or upper walls are called stalactites. The corresponding structures on cave floors are called stalagmites. When grown together, they form columns.

Pure travertine is white. The colors seen in the travertine shown above are from iron oxides.

Skyline Caverns is developed in structurally tilted carbonates (mixed dolostones and limestones) of the Rockdale Run Formation (Beekmantown Group, Lower Ordovician).

Locality: Skyline Caverns, Front Royal, central Warren County, northern Virginia, USA
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Source https://www.flickr.com/photos/47445767@N05/27747596702/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27747596702. It was reviewed on 22 February 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 February 2023

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